Detects small metal objects such as nails or screws. Interference elimination alerts. Operator detection alerts. Operating frequency of 7.1kHz. Comfort grip. Requires one 9-volt battery (not included). The Bounty Hunter HandyMan Nail Finder Hand-Held Metal Detector is more than just another stud finder. This effective metal detector can help you locate nails, screws, staples, wire, tacks, bullets, or any other metal object that could damage your saw, planer, or drill. It's sensitive enough to detect metal objects through six inches of wood. The simple function features sound warnings, but it also uses light and vibration alerts that can be easily recognized in a noisy shop. Its body features an ergonomic design and comfort-grip handle. All you need to get started is a nine-volt battery.